JPS60129148A - Apparatus for removing magnetic powder - Google Patents

Abstract

PURPOSE:To remove magnetic powder easily and surely by providing a permanent magnet which attracts magnetic powder mixed with fluid in the inside of a pipe wherein the fluid is flowing in an apparatus for removing the magnetic powder mixed with the oil for cooling machines. CONSTITUTION:Liquid is flowed in the axial direction of a pipe body 11 and the magnetic powder contained in the liquid is attracted to the inner peripheral surface of a permanent magnet 12 when the liquid is passed therethrough. The magnet 12 is large in the inner diameter and thin-walled, and the resistance of pipeline for said liquid is small. Also, the magnet 12 is composed of a radially magnetized rare earth cobalt magnet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic powder removal device that uses a permanent magnet to attract and remove magnetic powder mixed in, for example, cooling oil for mechanical cooling.

[Technical background of the invention and its problems]

In machines such as precision machine tools and automobile engines,
In order to cool the drive section, a method is used in which the cooling oil is circulated through the entire pipe by a pump and cooled by passing it through the drive section.

However, in this case, metal powder such as hostile iron powder generated by the wear of metal parts in the drive part of the machine mixes with the cooling oil passing through the drive part of the machine and mixes with the cooling oil. The conduit may flow through the machine drive unit and the bon 1vi - causing failure. For this reason, it is necessary to remove metal powder from the cooling oil flowing through the pipes.

However, in order to remove the metal powder mixed in the cooling oil, a filter has been conventionally provided in the middle of the pipe, but the metal powder is so fine that it cannot be removed satisfactorily by the filter. A method of removing magnetic metal powder such as iron powder by attracting it with a permanent magnet is used. That is, as shown in FIG. 1, an oil sump 2 is provided in the middle of a pipe 1, and a permanent magnet 3 is provided at the inner bottom of this oil sump 2 to prevent the oil from being mixed in the cooling oil 4 passing from the pipe 1 to the oil sump 2f. The permanent magnet 3 attracts the magnetic powder.

However, in this case, the magnetic powder contained in the cooling oil 4 that accumulates at the bottom of the oil sump 2 can be adsorbed by the permanent magnet 3, but the magnetic powder mixed in the cooling oil 4 that passes through the upper part of the oil sump 2 can be adsorbed by the permanent magnet 3. It is difficult to remove magnetic powder, and the overall removal efficiency of magnetic powder is low.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and provides a magnetic powder removal device that can easily and reliably remove magnetic powder mixed in fluid such as machine cooling oil using a permanent magnet.

[Summary of the invention]

The magnetic powder removal device of the present invention includes a tube in which a liquid flows.
A permanent magnet is installed to attract magnetic powder mixed into the liquid, and the entire particle is removed using a permanent magnet.

The permanent magnet used is a ring-shaped permanent magnet that runs along the inner circumferential wall of the tube. As a result, the ring-shaped permanent magnet acts magnetically from the entire circumferential direction of the tubular body, and can efficiently attract magnetic powder mixed into the liquid.

A rare earth cobalt magnet is used as the permanent magnet. This rare earth cobalt magnet has a large maximum energy product (BH) max and has excellent performance.

For this reason, the permanent magnet installed inside the tube is made smaller,
The pipe resistance against the liquid due to the permanent magnet can be reduced, and magnetic powder mixed in the liquid can be reliably attracted. It is also possible to use permanent magnets made of other materials, such as ferrite magnets or alnico magnets.

The permanent magnet used is radially magnetized or end face magnetized. In radial magnetization, a permanent magnet is magnetized in its radial direction, and the inner peripheral surface of the permanent magnet becomes a magnetized surface, that is, an attraction surface that attracts magnetic powder. For this reason, a radially magnetized ring-shaped permanent magnet holds a constant N magnet, and a radially magnetized permanent magnet is used to remove magnetic powder mixed into the liquid flowing along the axial direction of the tube. and suitable. Further, end face magnetization is a method of magnetizing the permanent magnet along the axial direction, and both end faces of the permanent magnet become the magnetized surfaces, that is, the magnetized surfaces of the magnetic powder. A permanent magnet whose end face is magnetized is suitable for removing magnetic powder mixed in a flowing liquid while rotating in a spiral manner.

When a plurality of ring-shaped permanent magnets are provided in combination, the permanent magnets are provided with gaps in the axial direction of the tube.

For example, when a liquid rotates and flows in a spiral pattern, a plurality of ring-shaped permanent magnets with magnetized end faces are provided with gaps in the axial direction of the tube, and a plurality of ring-shaped permanent magnets are provided in the end face gap of each permanent magnet. A non-magnetic spacer is provided with a gap in the circumferential direction of the tube. According to this, the magnetic powder contained in the liquid flowing in a spiral is collected in the tendrils partitioned by each non-magnetic spacer in the gap between each permanent magnet, and is attracted to the end face of the permanent magnet. The magnetic powder will not be dispersed into the liquid again due to the flow. Alternatively, a plurality of radially magnetized ring-shaped permanent magnets may be provided with gaps in the axial direction of the tube.

This is applicable when the liquid flows in the axial direction of the tube.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to drawings.

FIG. 2 shows an embodiment of the magnetic powder removing apparatus of the present invention. This removes magnetic powder contained in the liquid flowing in the axial direction of the tube. In the figure, 11 is a tube made of steel, 12
is a ring-shaped permanent magnet that is attracted and fixed to the inner circumference of the tube body 11.

The permanent magnet 12 is made of a radially magnetized rare earth cobalt magnet. The liquid flows in the axial direction of the tube body 1,
The magnetic powder contained in this liquid is attracted to the inner peripheral surface of the permanent magnet 12 when the liquid passes through it. Since the permanent magnet 12 has a large inner diameter and a thin wall, the pipe resistance against the liquid is small.

An example of dimensions in this case is that the inner diameter of the tube 11 is 28 mm.
, the length of the permanent magnet is 10 mm, and the thickness is 3 mm.

The magnetic powder removing device of this embodiment is used, for example, to remove magnetic powder contained in cooling oil of a machine. FIG. 4 is a schematic diagram showing a configuration in which the device of the present invention is installed in a cooling oil circulation pipe. In the figure, P is the pump and M is the drive part of the machine.

FIG. 3 shows another embodiment. This lever embodiment removes magnetic powder contained in the liquid that rotates in a spiral manner. In the figure, reference numeral 13 denotes a plurality of ring-shaped permanent magnets arranged at intervals in the axial direction inside the tubular body 1, and these are made of rare earth cobalt magnets. In the figure, reference numeral 14 denotes a plurality of non-magnetic spacers provided along the circumferential direction of the tubular body 11 in the gap between the end faces of each permanent magnet 13. and,
The magnetic powder contained in the spirally flowing liquid is collected in the gaps between the permanent magnets and is attracted to the end face of the permanent magnet 13, and is prevented from being dispersed into the liquid again by the non-magnetic spacer 14.

〔Effect of the invention〕

As explained above, the magnetic powder removal device of the present invention can efficiently remove magnetic powder contained in a liquid such as machine cooling oil using a 1° permanent magnet.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional device, Fig. 2 is a cutaway perspective view showing one embodiment of the device of the present invention, Fig. 3 is a cutaway perspective view showing another embodiment, and Fig. 4 is a cutaway perspective view showing an embodiment of the device of the present invention. FIG. 2 is an explanatory diagram showing a machine cooling oil conduit provided with a device. 1...Pipe line, 2...Oil reservoir, 3...Permanent magnet, 1
No... tube body, 12.13... permanent magnet, 14...
Non-magnetic spacer. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 4

Claims (1)

[Scope of Claims] α) A magnetic powder removing device characterized in that (1i), a permanent magnet is provided inside a pipe through which a fluid flows to attract magnetic powder mixed into the fluid. (2) The magnetic powder removing device according to claim 1, wherein the permanent magnet is ring-shaped. 0) The magnetic powder removing device according to claim 1 or 2, wherein the permanent magnet is a rare earth cobalt magnet. @) The magnetic powder removing device according to any one of claims 1 to 3, wherein the permanent magnet is radially magnetized. (6) The magnetic powder removing device according to any one of claims 1 to 3, wherein the permanent magnet is end-face magnetized. (Magnetic powder removal device according to any one of Items 2 to 5 of the scope of the request for special feature, in which a plurality of permanent magnets in a 6-ring shape are provided with gaps in the axial direction of the tube body. 7) A plurality of ring-shaped permanent magnets with magnetized end faces are provided with gaps in the axial direction of the tube, and in the gaps between each permanent magnet, a plurality of non-magnetic magnets are provided with gaps in the circumferential direction of the tube. The magnetic powder removing device according to claim 6, which is provided with a spacer.